lammps/doc/partition.txt

"LAMMPS WWW Site"_lws - "LAMMPS Documentation"_ld - "LAMMPS Commands"_lc :c

:link(lws,http://lammps.sandia.gov)
:link(ld,Manual.html)
:link(lc,Section_commands.html#comm)

:line

partition command :h3

[Syntax:]

partition style N command ... :pre

style = {yes} or {no}
N = partition number (see asterisk form below)
command = any LAMMPS command :ul

[Examples:]

partition yes 1 processors 4 10 6
partition no 5 print "Active partition"
partition yes *5 fix all nve
partition yes 6* fix all nvt temp 1.0 1.0 0.1 :pre

[Description:]

This command invokes the specified command on a subset of the
partitions of processors you have defined via the -partition
command-line switch.  See "Section_start 6"_Section_start.html#start_7
for an explanation of the switch.

Normally, every input script command in your script is invoked by
every partition.  This behavior can be modified by defining world- or
universe-style "variables"_variable.html that have different values
for each partition.  This mechanism can be used to cause your script
to jump to different input script files on different partitions, if
such a variable is used in a "jump"_jump.html command.

The "partition" command is another mechanism for having as input
script operate differently on different partitions.  It is basically a
prefix on any LAMMPS command.  The commmand will only be invoked on
the partition(s) specified by the {style} and {N} arguments.

If the {style} is {yes}, the command will be invoked on any partition
which matches the {N} argument.  If the {style} is {no} the command
will be invoked on all the partitions which do not match the Np
argument.

Partitions are numbered from 1 to Np, where Np is the number of
partitions specified by the "-partition command-line
switch"_Section_start.html#start_7.

{N} can be specified in one of two ways.  An explicit numeric value
can be used, as in the 1st example above.  Or a wild-card asterisk can
be used to span a range of partition numbers.  This takes the form "*"
or "*n" or "n*" or "m*n".  An asterisk with no numeric values means
all partitions from 1 to Np.  A leading asterisk means all partitions
from 1 to n (inclusive).  A trailing asterisk means all partitions
from n to Np (inclusive).  A middle asterisk means all partitions from
m to n (inclusive).

This command can be useful for the "run_style verlet/split" command
which imposed requirements on how the "processors"_processors.html
command lays out a 3d grid of processors in each of 2 partitions.

[Restrictions:] none

[Related commands:]

"run_style verlet/split"_run_style.html

[Default:] none